Flipper - Original - S.O.S Dolphin

Full-length episode - 25.35 min. (1964)
Season 1, episode 3 'S.O.S Dolphin'.
Sandy, Bud, and Flipper are playing around underwater in Coral key Park, and are startled by the appearance of a small submarine. It's a poisonous fish specialist looking for the poisonous 'scorpion fish' in the area. but he accidentally comes into deadly contact with the scorpion fish. Will Flipper save the marine doctor poisoned by a fish sting?
Note: commercial interruptions.